Liquid chromatographic method for the analysis of tocopherols in malt sprouts with supercritical fluid extraction. |
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| Authors: | G Carlucci P Mazzeo S Del Governatore G Di Giacomo G Del Re |
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| Institution: | Department of Chemistry, Chemical Engineering and Materials, University of L'Aquila, Coppito (AQ), Italy. carlucci@univaq.it |
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| Abstract: | A simple, specific and sensitive high-performance liquid chromatographic method has been developed for the determination of tocopherols in malt sprouts. A supercritical fluid extraction (SFE) procedure was used to isolate tocopherols from the vegetal matrix before quantitative analysis. The analytes were separated on a Zorbax reversed-phase column using methanol-water as mobile phase and quantified by measuring its fluorescence at lambda(em)=328 nm after excitation of the analytes at lambda(exc)=303 nm. The limits of detection for alpha-, gamma- and delta-tocopherols were 0.04, 0.05, and 0.05 microg/ml, respectively. The calibration graphs of the method were linear from 0.1 to 1.5, 0.2 to 2.5, and 0.2 to 2.0 microg/ml, for alpha-, gamma- and delta-tocopherols, respectively. This SFE and HPLC procedure is simple, precise and accurate for the determination of tocopherols in malt sprouts. |
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